Advertisements
Advertisements
प्रश्न
The longitudinal waves travel in a coiled spring at a rate of 4 m/s. The distance between two consecutive compressions is 20 cm. Find :
(i) Wavelength of the wave (ii) Frequency of the wave
Advertisements
उत्तर
The distance between two consecutive compressions or rare factions is equal to its wavelength.
Hence, from the diagram of wave we can say that wavelength is 0.2 m.
(ii) Now we have to calculate the frequency of the wave.
Given: Velocity ν = 4 m/s
Wavelength λ = 0.2 m
We know the relation between velocity, frequency, and wavelength `f = v/lambda` ,
where v is the velocity of sound , f the frequency , and `lambda` the wavelength .
so ,
`f = 4/0.2` Hz
= 20 Hz
Therefore , frequency of the wave is 20 Hz .
APPEARS IN
संबंधित प्रश्न
You recognize your friend by hearing his voice on a telephone. Explain.
How can the pitch of sound produced in a piano be changed ?
The flash of a gun is seen by a man 3 seconds before the sound is heard. Calculate the distance of the gun from the man (Speed of sound in air is 332 m/s).
In an experiment, Anhad studies sound waves. He sets up a loudspeaker to produce sound as shown below :
Anhad adjusts the signal to the loudspeaker to give a sound of frequency 200 Hz.
(a) What happens to the air in-between Anhad and the loudspeaker ?
(b) Explain how Anhad receives sound in both ears.
Draw a displacement-distance graph of a wave and mark on it, the amplitude of wave by the letter 'a' and wavelength of wave by the letter λ.
The heart of a man beats 75 times a minute. What is its (a) frequency and (b) time period?
Match the pairs.
| Group ‘A’ | Group ‘B’ |
| (a) Flute | (1) Frequency less than 20 Hz |
| (b) Frequency | (2) Frequency more than 20000 Hz |
| (c) Sound level | (3) Vibrations in the air |
| (d) Ultrasonic sound | (4) Measured in Hz |
| (e) Infrasonic sound | (5) Decibel |
How do the following factor affect the speed of sound in air?
Moisture in air.
Give an example to show that light travels faster than sound?
Waves created by Earth Quake are Infrasonic.
